I applied online and they called me a couple of weeks later for an in-house interview. You do an English test that includes some writing. They are mainly testing your grammar and vocabulary. You can prepare easily by the many online tests available on the internet. Following the English exam I had a panel interview with a group of interviewers. They mostly ask about your background and work experience. Some behavioral questions are also thrown in the mix. They are very friendly and you don't feel any pressure from being interviewed by several people at the same time.